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Myosin and actin, two protein filaments, make up the majority of myofibrils.
Actin and myosin-containing myofibrils make up the myofibrils that make up muscles. Actomyosin, a contractile protein formed by actin and myosin under the control by adenosine triphosphate (ATP), is necessary for muscle contraction. Each myofibril in a muscle fiber is made up of numerous filaments, just because each muscle fiber includes many myofibrils. The thin filament as well as the thick filament are the two primary types of these filaments. Actin is the primary component of the thin filament, whereas myosin is the primary component of a thick filament. Actin, myosin, titin, and other lengthy proteins make up myofibrils, which are held together by other proteins. These proteins are arranged in thick, thin, but elastic myofilaments, which repeat in sections or units of contraction known as sarcomeres throughout the length of the myofibril.
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